King's Brand 8-Inch Twin Size Memory Foam Mattress With Fabric Cover Kings Brand 8-Inch Twin Size Memory Foam Mattress With Fabric Cover. This dense, responsive 8-inch memory foam mattress shapes around the body for exceptional comfort and support. A premium layer of memory foam disperses weight evenly and improves circulation while reducing pressure points that can disrupt sleep. Great for platform beds and slatted frames This product arrives very tightly packed. Unwrap and allow 48 hours for this product to return to its original shape. Dimensions: 39" x 75" x 8".